/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */
package org.apache.flume.channel.file;

import com.google.common.base.Preconditions;
import org.apache.flume.channel.file.proto.ProtosFactory;

import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

/**
 * Represents a Take on disk
 */
class Take extends TransactionEventRecord {
    private int offset;
    private int fileID;

    Take(Long transactionID, Long logWriteOrderID) {
        super(transactionID, logWriteOrderID);
    }

    Take(Long transactionID, Long logWriteOrderID, int offset, int fileID) {
        this(transactionID, logWriteOrderID);
        this.offset = offset;
        this.fileID = fileID;
    }

    int getOffset() {
        return offset;
    }

    int getFileID() {
        return fileID;
    }

    @Override
    public void readFields(DataInput in) throws IOException {
        super.readFields(in);
        offset = in.readInt();
        fileID = in.readInt();
    }

    @Override
    public void write(DataOutput out) throws IOException {
        super.write(out);
        out.writeInt(offset);
        out.writeInt(fileID);
    }

    @Override
    void writeProtos(OutputStream out) throws IOException {
        ProtosFactory.Take.Builder takeBuilder = ProtosFactory.Take.newBuilder();
        takeBuilder.setFileID(fileID);
        takeBuilder.setOffset(offset);
        takeBuilder.build().writeDelimitedTo(out);
    }

    @Override
    void readProtos(InputStream in) throws IOException {
        ProtosFactory.Take take = Preconditions.checkNotNull(
                ProtosFactory.Take.parseDelimitedFrom(in), "Take cannot be null");
        fileID = take.getFileID();
        offset = take.getOffset();
    }

    @Override
    short getRecordType() {
        return Type.TAKE.get();
    }

    @Override
    public String toString() {
        StringBuilder builder = new StringBuilder();
        builder.append("Take [offset=");
        builder.append(offset);
        builder.append(", fileID=");
        builder.append(fileID);
        builder.append(", getLogWriteOrderID()=");
        builder.append(getLogWriteOrderID());
        builder.append(", getTransactionID()=");
        builder.append(getTransactionID());
        builder.append("]");
        return builder.toString();
    }
}
